Piston head for pumps



. S. C. HILLS PISTON HEAD FOR PUMPS Filed March 16. 1923 L u I! f- .IFZ c Q I WITNESSES 2s INV ENTOR 15'. 6.729114;

A TTORNE YS Patented May 13, 1924.

narran snares PATENT oFFicE.

SIDNEY C HILLS, OF TORRINGTO'N, CONNECTICUT, ASSIGNOR F ONE-HALF TO JOHN B. 1 COLT, 0F TORRINGTON, CONNECTICUT.

PISTON HEAD FOR PUMPS.

Application filed March 16, 1923. Serial 1%. 625,599.

To all whom. it may concern Be it known that l, SIDNEY C. Thus, a citizen of the United States, and a resident of Torrington, in the county of Litchfield and State of Connecticut, have invented a new and Improved Piston Head for Pumps,

I of which the following is a full, clear, and

exact description.

The present invention relates to new and useful improvements in pumps and it pertains more particularly to a piston head construction therefor.

It is one of the objects of the present invention to provide a construction for piston heads which will maintain the washer forming the head at all times in engagement with the walls of the cylinder.

It is a further object of the invention to maintain the contact between the head of the pump and the walls of the cylinder by resilient means.

It is a further object of the invention to construct the piston head so that it may be readily assembled and disassembled.

lVith the above and other objects in view. reference is had to the accompanying drawings, in which- Fgure 1 is a-detail longitudinal sectional view of a pump cylinder and a piston head constructed in accordance with the present invention;

Fig. 2 is a horizontal sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is a detail longitudinal sectional view of a pump cylinder and piston head of slightly modified form;

Fig. & is a plan view of one of the elements employed in the form of assemblage shown in Fig. 3;

Fig. 5 is a detail longitudinal sectional view of a pump cylinder and piston head construction of still further modified form;

Fig. 6 is a horizontal sectional view taken on the line 6-6 of Fig. 5.

Referring more particularly to the drawings. the reference character 10 designates the pump cylinder. and the reference char acter 11 designates the piston rod, said piston rod being formed near one of its ends with a shoulder 1.2. The end of the piston rod 11 adjacent the shoulder 12, is screwthreaded as shown at 13. Mounted upon the piston rod 11 and in engagement with the shoulder 12. is a plate 1%. and carried by the plate 1a is a leather washer 15, which forms the piston head. Seated upon the leather washer 15 and surrounding the threaded end of the piston rod 11, is a washer-'16, and resting upon said washer 16 is a plate 17. This plate 17 has oppositely-disposed arms or fingers 18, and said arms or fingers 18 have their ends upwardly bent as at 19. Seated upon the washer 15 and occupying a position beneath the upwardly-bent ends of the'plate 17, is a circular resilient member 20. r

In pumps of this type it is the common practice to form the washer 15 from leather and to shape the same in such a manner that it presents an annular flange adapted for contact with the inner surface of the walls of the cylinder. The resilient member 20 employed in the present invention is adapted to engage this washer at the point where the body portion thereof is bent to form the flange, and by this construction it is apparent that the washer 15 is maintained in flanged position and its flange at all times maintained in contact with theinner surface of the cylinder walls. To secure the parts in assembled position. a nut 17 has engagement with the screw-threaded end 13 of the piston rod 11.

In that form of the invention shown in Figs. 3 and 4:, the several elements are of the same character as that shown in Figs. 1 and 2, except that in lieu of the plate 17 with the oppositely disposed arms 18, a plate 21 is employed and said plate 21 has three equidistantly spaced arms 22 upwardly bent as at 23. This plate when positioned in place upon the washer 16 engages the resilient member 20 and serves to retain the same in position.

In the modified form shown in Figs. 5 and 6. the reference character 25 designates the piston rod provided with an annular flange or shoulder 26, and a screw-threaded end 27. 28 is a plate which is adapted to rest upon the annular flange or shoulder 26, and adapted to rest upon this plate 28, is a second plate 29. The plate 20 is bent upwardly as at 30, with its outer peripheral edge 31 spaced from the outer peripheral edge of the plate 28. Between the peripheral edges of the plates 28 and 29, a ring 32 is mounted, and said ring is preferably formed of leather or other suitable material having its ends beveled as designated by the reference character 33 in Fig.

6. Mounted between the plates 28 and 29, is a resilient member 34, and said resilient member 34 is adapted to exert an outward pressure upon the ring 32 to maintain its engagement with the inner surface of the walls of the cylinder 5. To secure the sev eral parts in this relation, a nut 35 having threaded engagement with the threaded end 27 of the piston rod is employed.

From the foregoing it is apparent that the present invention provides a new and improved form of piston head particularly adapted for use in hand pumps, and that by means of the construction employed a tight working joint is had at all times between the piston head and the inner surface of the walls of the pump cylinder.

lVhat is claimed is:

A piston for use in cylinders, comprising a flanged piston rod, a plate carried by the piston rod and resting on said flange, said plate being of a smaller diameter than the cylinder in which the piston is tobe used,

a flanged washer of pliable material, the flange of said Washer being adapted to engage the walls of the cylinder in Which the piston is to be used, a resilient ring member mounted within the flanged Washer, said resilient ring member acting to force the flange of the Washer outwardly into engagement with the Walls of the cylinder, a spider carried by the piston rod and having its projecting arms engaging the resilient ring-like member to maintain it in operative position relative to the flange of the washer, and a nut threaded on the end of the piston rod and adapted to maintain the plate in engagement with the flange of the piston rod, the washer in engagement with the plate, the resilient ring-like member in engagement with the flange of the Washer through the medium of said Spider, and retain the spider in position upon the piston rod.

SIDNEY C. HILLS. 

